I think you are refering to WPBA-30 which is the Atlanta Board of Education station. They simulcast the analog signal on their digital channel. I think they dropped the HD as they had to pay PBS for it. GPB, the state-wide PBS network (WGTV - 8 in Atlanta), has not yet begun broadcasting a digital signal. Not sure what the delay is. I would assume both PBA30 and GPB will be carried once their digital signals are up and running. Update: Apparently, WGTV IS broadcasting digitally but at very low-power on Ch.12. This is so that they will not interfere with WDEF-12 out of Chattanooga. In Feb 2009, when the analog signals turn off, WGTV's digital signal will be switch to full power on Ch. 8.